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If a stock EVX2 then the battery plug with the red tag is the BEC side pack .... but you are disabling it so both packs would drain the same.

What voltage are you planning to feed your UBEC .... 2S or 4S?

You could feed your UBEC from the balance tap on your lipo with the right adapter.

Just remember .... the EVX2 is internally wired for series and when both 2S packs are pluged in to the stock EVX2 wiring you no longer have two 2S packs ...you have a 4S pack.

Use a meter and find the common ground and power to find the internal series connection. Don't go by this or any other drawing!!

Electrically you have a lot of options by eliminating the BEC circuit .... like running on two 4S packs in parallel .... but you REALLY need to understand the INTERNAL SERIES wiring of the EVX-2 to avoid a bad mistake.

If I'm reading the specs .... I hope #1 is output voltage 5V .... and it is saying 3S to 8S lipos for input... so you'd have to use the ground on the BEC side plug and the power off the other and input 3S or 4S somehow. Personally I'm a bit suspect of a $3 UBEC making those claims!!!

thanks for the inspection....
I will not use that $3.00 BEC that I bought....it is not worth risking it.....
can you give me the Links to the BEC you prefer....
again, I'm using Stock everything and I use a Two 2s-5000mah Lipo packs.

thanks

p.s. that Link you gave up above had serveral BEC..... which one is the simplest.....

As far as the Dimension Engineering products .... with your FPV application I would go with the Sport BEC .... and input 4S voltage with 6V output selected. This should give you plenty of juice to run all your servos.

ALL Dimension Engineering products IMO are top notch. I have their voltage regulator installed in my DX-7 Tx.

The Castle BEC would be more than sufficient as well. To program it up though, you also need to have the Castle Link to connect to the computer. It programs through the servo wire that goes into your receiver to power everything up.
You definitely want 6V on your BEC as the stock ESC puts out 6V from the internal BEC. Otherwise, you'll lose out on some torque from your steering servos.
As to which battery to put the input on, it doesn't matter. Just remember that whichever one you put it on will drain faster than the other unless you do it on the 4S setup and connect to the proper leads on the ESC (you'll need to measure like others have suggested to find where to connect to).
Good luck and hopefully you'll get that other one sold!

Or could anyone explain how to configure the system to power individual servos to 7.4? If its even possible?

quadiak brings up a good point! I'm so used to my other truck (which only has the ESC and ONE [steering] servo.

I forgot about the other servos that the Summit has!

Maybe I should just stick to 6.0 volts... (was hoping to use 7.4v since some steering servos (such as the newer Hitec ones) are rated to 7.4v, and therefore have slightly more torque and faster response).